Adjective used to refer to a person usually male who will have sex with any woman. Someone who is so indiscriminate that they would fuck a female monkey. Eventually its use was broadened so that it became used to describe anyone whose habits are unpleasant, unsavoury or just plain weird.
"Malcolm, you are, without doubt, the most useless cunt eyed, shit-licking, monkey fucking, piss-brained, ass kissing, fuck witted WOSP in the world!"